Janet...

This might make you feel a little more at ease. My doctor was concerned about coronary artery disease because I have several risk factors (in his estimation), so he sent me for a Thallium stress test. This is a test where they inject a radioactive substance (sestamibi) into your bloodstream and then take special images of your heart (both resting and after exercising on a treadmill) to see how the blood circulates. If there are any blockages or areas of your heart that are getting less blood, it will show up as dark spots on the images.
I had the test this morning. Result (after 18 months on a high fat/low carb diet)? Completely normal and no blockages or coronary artery disease to be seen anywhere!